Machine for truing worms.



W. E. BOCK.

MACHINE FOR TRUING worms.

APPLICATION FILED MAY 11, I914 1,159,739.

Patented Nov. 9, 1915.

3 SHEETSSHEET I.

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W. E. BOCK.

MACHINE FOR TRUING WORMS.

APPLICATION FILED MAYII. 19x4.

1,159,739. latented Nov. 0, 1915.

3 SHEETSSHEET 2.

I BY Li,

Arromvfy W. E. BOCK.

MACHINE FOR TRUING WORMS.

APPLICATION FILED MAY 11. 19x4.

Patented Nov. J, 19H).

3 SHEETS-SHEET 3 WILLIAM EMIL BOOK, OF TOLEDO, OHIO.

Specification of Letters Patent.

MACHINE FOR' TRUING WORMS.

Patented N0v 9, 1915.

Application filed May 11, 1914. Serial N 0. 837,934.

To all whom it may concern:

Be it known that I, WILLIAM EMIL BOOK, a citizen of the United States ofAmerica, residing at Toledo, in the county of Lucas and State of Ohio,have invented certain new and useful Improvements in Machines for TruingWorms, of which is a specification, reference being had there-, in tothe accompanying drawings.

The invention relates to machines for forming worms or worm-gearing, andhas particular reference to a construction adapted for the truing of theworms after the. heat treatment process.

In the drawings :'Figure 1 is a side elevation of the machine; Fig. 2 isa plan view thereof; Fig. 3 is an end elevation; Fig. 4. is a crosssection on line w-m Fig. 2; and Fig. 5 is an elevation illustratingamodified construction.

My improved construction is designed moreparticularly for the truing ofworms or spiral gears of thattype adapted for cooperation with rollerpin gears, or gears in which the roller teeth project laterallytherefrom to engage the worm. With; worms of this type there is avariation'in the angle which is controlled ,of-the spiral, due to thetransverse movement of the roller teeth produced in a movement through acircular orbit. This renders the grinding and truing of the Wormdifficult if not impossible by any of the methods ordinarily employed.With my improved machine the accuracy by combining with the relativelongitudinal and rotary movement of the grinder and blank a transversemovement, by a properly fashioned cam. This transverse movement changesthe angle of contact between the grinder wheel and the work and producesa true contour for cooperation with the roller pin gear. w

In detail, A'is a suitable frame provided with longitudinall -extendingways B for .a slidable carriage C.

D are bracket arms'projecting upward from the carriage C, in which isjournale an arbor E for supporting the worm F which is to be ground. Thearbor E is further' provided with a worm or spiral gear G having auniform pitch and which engages a threaded bearing H in a yoke orbracket I secured to the stationary part of the machine, the arrangementbeing such that the rotation of the arbor E will cause the followingworms are ground with perfect upon a shaft S the worm G to feed saidarbor together with its supporting along the guides B.

J is a gear-wheel upon the arbor E which is in mesh with a pinion K ofsuflic ient length to'reta'in its engagement With the gear-Wheel duringthe movement of the carrlage. v

L is a drive means for reciprocating the carriage, preferably consistingof tight and loose pulleys and reverse belts, such as commonly employedfor this purpose.

Mounted upon the stationary part of the frame and at an angle to theaxis of the arbor are vertical guides M, and N is a slidableheadengaging said guides.

O and O are transversely-arranged horizontal slides at the top of theslide N, and

is a grinding arbor journaled in bearings on the slide 0 and having thegrinder wheel Q mounted thereon.

The arrangement issuch that by suitable adjustment of the slides O and Oby means of adjusting screws R and R, the grinder wheel may be set in apredetermined relation to the work wherethe periphery of the '.wormengaging the threaded bearing H.

The pitch of this Worm G is not, however, the same as that of the blankto be ground, inasmuch as the latter is designed to cooperate with' a.roller pin wheel, and further provision is therefore made. for movingthe grinder wheel transversely of the axis of the work. This comprises acam S mounted medium of intermeshing gearwheels T and T from the shaftof the pinion K. This cam is connected N by the link S is so fashionedto operate thevertical slide and roller Si, and the cam that the grinderwheel Q ,-will be raised and lowered during the movement of the carriageC in exact correspondence to the rising and-falling of the roller pin inpassing about its circular orbit. As a consequence the worm blank willbe trued so as to perfectly intermesh with the coiiperating pin-Wheel.

In the complete operation of the machine, the carriage is reciprocatedby shifting the belts upon the pulleys L, drives the gearing in reversedirections. This movement also reciprocates the vertical and driventhroughthe' bearing and the carriage C which alternately 1 10 slide Nthrough the medium of a cam S in the manner above' described. I

A shown in Fig. 5, in place of the grinder wheel arranged to grind withits peripheral 1 surface, I may employ a conical grinder wheel U whichis raised and lowered in the same manner as above described. This con--struction may be employed for grinding both faces of the spiral at thesame-time, while the construction first described grinds only a singleface. I

What I claim as my invention is 1. The combination with a rotaryblankholding arbor, of a grinder-wheel, meansfor relativelyreciprocating said arbor and q grinder-wheel longitudinally of the axisof the former, and cooperating means for producing a-relative transversemovement during the longitudinal reciprocation.

2. The combination with a rotary blankholding arbor and a grinder-wheel,of a carriage on which one ,of said elements is mounted, adaptedforlongitudinal reciprocation with respect to the other element, a wormmounted on the arbor engaging a threaded bearing on the mounting for thegrinder, forming. the means for relatively reciprocating the same,mechanism for rotating the arbor and worm, and a cam operated by saidmechanism for raising and lowering the grinder-wheel in a directiontransverse to said relative reciprocating movement.

3. The combination with a frame, of a carriage slidably mounted on saidframe, a

' rotary blank-holding arbor journaled in bearings on said carriage, aworm mounted on said arbor, a threaded bearing engaging said worm havinga fixed'support upon said frame, a slide engaging vertical ways uponsaid frame, a grinder-wheel mounted on said slide and adjustable inrelation to theblank, a cam for vertically moving said in presenceslide, and mechanism for operating said cam and rotating said arbor intimed irelawheel mounted on said slide and adjustable in relation to theblank, a cam for reciprocating saidislide, and connecting mechanismbetween the mechanism for rotating said arbor and said cam for operatingthe latter in timed relation. i

5. The combination with a frame, of a carriage slidably mounted on saidframe, a

rotary blank-holding arbor journaled in bearings on. said carriage,vertical guides upon said frame at an angle to, the axis of said arbor,a slidable head engaging said guides, transverselyarranged horizontal.slides upon said" head, a rotary member mounted upon said slides andadjustable in relation to the blank with its circumferen tial face"adapted to act upon the blank,

means for reciprocating said arbor and said rotary member longitudinallyof the axis of the former relative to each other, and means forproducing a relative transverse movement during the longitudinalreciprocation.

v In testimony 'whereofl afiix my signature of two witnesses WILLIAMEMIL BOCK.

' Witnesses:

ADELAIDE I. ADAMS, JAMES P. BARRY.

